前段时间学习的CPLD与51单片机总线接口 一起分享
`timescale 1ns/1ns
module IO_KZ(Data,P27,WR,RD,ALE,CLR,OUTKEY,OUT30,CS,CS1,LEDCS,OC);
inout [7:0]Data;
input WR;
input P27;
input RD;
input ALE;
input CLR;
input OC;
input [4:0]OUTKEY;
output [59:0]OUT30;
output [1:0]CS;
output CS1;
output [14:0]LEDCS;
reg [14:0]LEDCS;
reg [59:0]OUT30;
reg [1:0]CS;
wire CS1;
//wire [7:0]Data;
reg [8:0]IOADD;
reg [15:0]DataBF;
reg wr_en;
reg [7:0]OUTKEYBF;
//wire [7:0]OUTKEYBF1;
assign CS1=((IOADD==338)&&(OC==0))?1'b0:1'b1;//8052
assign Data=((IOADD==277)&&(OC==0)&&(RD==0))?OUTKEYBF:8'bzzzzzzz;//8015
always @(OUTKEY)
begin
if(OUTKEY[0]==0)
OUTKEYBF<=1;
else if(OUTKEY[1]==0)
OUTKEYBF<=2;
else if(OUTKEY[2]==0)
OUTKEYBF<=3;
else if(OUTKEY[3]==0)
OUTKEYBF<=4;
else if(OUTKEY[4]==0)
OUTKEYBF<=5;
else
OUTKEYBF<=0;
end
always @(negedge ALE)
begin
IOADD<={P27,Data};//ALE下降延读地址
end
always @(IOADD or WR) //WR下降延写数据
begin
if((IOADD>256)&&(IOADD<337)&&(IOADD!=277))wr_en<=WR;
else
begin
wr_en<=1;
end
end
always @(negedge wr_en or posedge OC or posedge WR) //WR下降延写数据
begin
if(OC)
begin
CS=2'b00;
LEDCS=15'b00000_0000_0000_00;
end
else if(WR)
begin
CS=2'b00;
end
else
begin
case(IOADD)
261: begin CS=2'b01; end//8005
262: begin CS=2'b10;LEDCS=15'b00000_0000_0000_01;end//8006
263: begin CS=2'b10;LEDCS=15'b00000_0000_0000_10;end//8007
264: begin CS=2'b10;LEDCS=15'b00000_0000_0001_00;end//8008
265: begin CS=2'b10;LEDCS=15'b00000_0000_0010_00;end//8009
266: begin CS=2'b10;LEDCS=15'b00000_0000_0100_00;end//800A
267: begin CS=2'b10;LEDCS=15'b00000_0000_1000_00;end//800B
268: begin CS=2'b10;LEDCS=15'b00000_0001_0000_00;end//800C
269: begin CS=2'b10;LEDCS=15'b00000_0010_0000_00;end//800D
270: begin CS=2'b10;LEDCS=15'b00000_0100_0000_00;end//800E
271: begin CS=2'b10;LEDCS=15'b00000_1000_0000_00;end//800F
272: begin CS=2'b10;LEDCS=15'b00001_0000_0000_00;end//8010
273: begin CS=2'b10;LEDCS=15'b00010_0000_0000_00;end//8011
274: begin CS=2'b10;LEDCS=15'b00100_0000_0000_00;end//8012
275: begin CS=2'b10;LEDCS=15'b01000_0000_0000_00;end//8013
276: begin CS=2'b10;LEDCS=15'b10000_0000_0000_00;end//8014
endcase
end
end
always @(negedge wr_en or posedge CLR or posedge OC ) //WR下降延写数据
begin
if(OC)
begin
DataBF=0;
OUT30[59:0]=60'hfffffffffffffff;
end
else if(CLR)
begin
DataBF=0;
OUT30[59:0]=60'hfffffffffffffff;
end
else
begin
if(Data[0])
DataBF[1:0]=2'b10;
else
DataBF[1:0]=2'b01;
if(Data[1])
DataBF[3:2]=2'b10;
else
DataBF[3:2]=2'b01;
if(Data[2])
DataBF[5:4]=2'b10;
else
DataBF[5:4]=2'b01;
if(Data[3])
DataBF[7:6]=2'b10;
else
DataBF[7:6]=2'b01;
if(Data[4])
DataBF[9:8]=2'b10;
else
DataBF[9:8]=2'b01;
if(Data[5])
DataBF[11:10]=2'b10;
else
DataBF[11:10]=2'b01;
if(Data[6])
DataBF[13:12]=2'b10;
else
DataBF[13:12]=2'b01;
if(Data[7])
DataBF[15:14]=2'b10;
else
DataBF[15:14]=2'b01;
case(IOADD)
257: begin OUT30[15:0] =DataBF;end//8001
258: begin OUT30[31:16]=DataBF;end//8002
259: begin OUT30[47:32]=DataBF;end//8003
260: begin OUT30[59:48]=DataBF;end//8004
endcase
case(IOADD)
278: begin OUT30[1:0]=2'b10;end//8016
279: begin OUT30[1:0]=2'b01;end//8017
280: begin OUT30[3:2]=2'b10;end//8018
281: begin OUT30[3:2]=2'b01;end//8019
282: begin OUT30[5:4]=2'b10;end//801A
283: begin OUT30[5:4]=2'b01;end//801B
284: begin OUT30[7:6]=2'b10;end//801C
285: begin OUT30[7:6]=2'b01;end//801D
286: begin OUT30[9:8]=2'b10;end//801E
287: begin OUT30[9:8]=2'b01;end//802F
endcase
case(IOADD)
288: begin OUT30[11:10]=2'b10;end//8020
289: begin OUT30[11:10]=2'b01;end//8021
290: begin OUT30[13:12]=2'b10;end//8022
291: begin OUT30[13:12]=2'b01;end//8023
292: begin OUT30[15:14]=2'b10;end//8024
293: begin OUT30[15:14]=2'b01;end//8025
294: begin OUT30[17:16]=2'b10;end//8026
295: begin OUT30[17:16]=2'b01;end//8027
296: begin OUT30[19:18]=2'b10;end//8028
297: begin OUT30[19:18]=2'b01;end//8029
endcase
case(IOADD)
298: begin OUT30[21:20]=2'b10;end//802A
299: begin OUT30[21:20]=2'b01;end//802B
300: begin OUT30[23:22]=2'b10;end//802C
301: begin OUT30[23:22]=2'b01;end//802D
302: begin OUT30[25:24]=2'b10;end//802E
303: begin OUT30[25:24]=2'b01;end//802F
304: begin OUT30[27:26]=2'b10;end//8030
305: begin OUT30[27:26]=2'b01;end//8031
306: begin OUT30[29:28]=2'b10;end//8032
307: begin OUT30[29:28]=2'b01;end//8033
endcase
case(IOADD)
308: begin OUT30[31:30]=2'b10;end//8034
309: begin OUT30[31:30]=2'b01;end//8035
310: begin OUT30[33:32]=2'b10;end//8036
311: begin OUT30[33:32]=2'b01;end//8037
312: begin OUT30[35:34]=2'b10;end//8038
313: begin OUT30[35:34]=2'b01;end//8039
314: begin OUT30[37:36]=2'b10;end//803A
315: begin OUT30[37:36]=2'b01;end//803B
316: begin OUT30[39:38]=2'b10;end//803C
317: begin OUT30[39:38]=2'b01;end//803D
endcase
case(IOADD)
318: begin OUT30[41:40]=2'b10;end//803E
319: begin OUT30[41:40]=2'b01;end//803F
320: begin OUT30[43:42]=2'b10;end//8040
321: begin OUT30[43:42]=2'b01;end//8041
322: begin OUT30[45:44]=2'b10;end//8042
323: begin OUT30[45:44]=2'b01;end//8043
324: begin OUT30[47:46]=2'b10;end//8044
325: begin OUT30[47:46]=2'b01;end//8045
326: begin OUT30[49:48]=2'b10;end//8046
327: begin OUT30[49:48]=2'b01;end//8047
endcase
case(IOADD)
328: begin OUT30[51:50]=2'b10;end//8048
329: begin OUT30[51:50]=2'b01;end//8049
330: begin OUT30[53:52]=2'b10;end//804A
331: begin OUT30[53:52]=2'b01;end//804B
332: begin OUT30[55:54]=2'b10;end//804C
333: begin OUT30[55:54]=2'b01;end//804D
334: begin OUT30[57:56]=2'b10;end//804E
335: begin OUT30[57:56]=2'b01;end//804F
336: begin OUT30[59:58]=2'b10;end//8050
337: begin OUT30[59:58]=2'b01;end//8051
endcase
end
end
endmodule
评论